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Background Previously we found that pre-procedural nervousness and tension (translated into English as "anxiety"), assessed on a non-validated five-point scale, correlated with pain intensity of the various stages of bone marrow aspiration and biopsy (BMAB). The fewer the previous BMAB procedures the stronger the pain from a repeated procedure. The primary purpose of the present observational study is to evaluate the state of anxiety just before BMAB and to find out whether it affects the pain experiences during the various stages of the BMAB procedure. We also examined whether first-timers differ from patients with previous BMAB experience in the degree of anxiety and intensity of BMAB procedural pain. Methods A total of 166 adult outpatients undergoing the BMAB from the Helsinki University Hospital were enrolled, 48 of them being first-timers. The level of anxiety was measured with State-Trait Anxiety Inventory (STAI) and the pain experiences associated with the various stages of the procedure were evaluated on the NRS-scale (Numeral Rating Scale 0-10) and using the Finnish pain vocabulary. BMAB was planned to be performed under lidocaine infiltration anaesthesia but, on request, patients were allowed to receive premedication with diazepam orally or alfentanil i.m. If, in spite of supplemental local anaesthetic the patient still felt pain from the sampling needle tip, i.m. alfentanil was administered. Results There was a clear association between anxiety and pain during all stages of the procedure, except during biopsy. The NRS scores varied from 0 to 10 in all the various stages of BMAB. The first-timers did not differ from the more experienced patients with regard to pain experiences; only the pain felt during the local anaesthetic infiltration was milder (P = 0.007) in first-timers than in the others. Procedural pain in those who were given analgesic or sedative premedication was similar (P &lt; 0.05) to that in the non-premedicated patients. The words characterizing the pain of the various stages belonged to a major extent (76-90%) to the sensory class of words. Conclusion Pre-procedural anxiety had a major impact on the pain ratings. The first-timers and patients with previous experience of BMAB had a similar degree of pre-procedural anxiety, as well as of the intensity of procedural pain, except that infiltration of local anaesthetic was less painful in the first-timers. Implications Identification of anxious (fearful) patients prior to BMAB, and premedicating them individually may improve satisfaction in both patient and caregiver.

Anxiety and pain during bone marrow aspiration and biopsy